Simultaneous strain and temperature measurement by cascading few-mode fiber and single-mode fiber long-period fiber gratings

Abstract

A hybrid optical fiber structure of two cascading long-period fiber gratings (LPFGs), respectively, inscribed on a segment of few-mode fiber (FMF) and single-mode fiber (SMF), is proposed and experimentally demonstrated. This structure could be used for simultaneous measurement of strain and temperature. The FMF-LPFG exhibits an opposite temperature response and higher strain sensitivity compared to that of the SMF-LPFG, which can improve the measurement resolutions. Experimentally, the strain and temperature sensitivities of the proposed sensor are $-2.9\mathrm{pm}/\mathrm{\mu \epsilon }$ and $-17.6\mathrm{pm}/°\mathrm{C}$, respectively, for the FMF-LPFG; for the SMF-LPFG, these are $-1.47\mathrm{pm}/\mathrm{\mu \epsilon }$ and $46.4\mathrm{pm}/°\mathrm{C}$, respectively. The maximum errors are $\pm 7.98\mathrm{\mu \epsilon }$ and $\pm 0.54°\mathrm{C}$ for strain and temperature, respectively.

© 2014 Optical Society of America

Simultaneous measurement of strain and temperature by two peanut tapers with embedded fiber Bragg grating

Lingya Lv, Sumei Wang, Lan Jiang, Fei Zhang, Zhitao Cao, Peng Wang, Yi Jiang, and Yongfeng Lu
Appl. Opt. 54(36) 10678-10683 (2015)

Reflective long-period fiber grating-based sensor with Sagnac fiber loop mirror for simultaneous measurement of refractive index and temperature

Jianying Yuan, Chun-Liu Zhao, Yumeng Zhou, Xiangdong Yu, Juan Kang, Jianfeng Wang, and Shangzhong Jin
Appl. Opt. 53(29) H85-H90 (2014)

Simultaneous force and temperature measurement using long-period grating written on the joint of a microstructured optical fiber and a single mode fiber

Jianbo Xu, Yan-ge Liu, Zhi Wang, and Boyin Tai
Appl. Opt. 49(3) 492-496 (2010)

Simultaneous temperature and strain measurements performed by a step-changed arc-induced long-period fiber grating

Gaspar Rego, Rosane Falate, Oleg Ivanov, and José Luís Santos
Appl. Opt. 46(9) 1392-1396 (2007)

Discrimination between strain and temperature by cascading single-mode thin-core diameter fibers

Jie Shi, Shilin Xiao, Miehua Bi, Lilin Yi, and Pei Yang
Appl. Opt. 51(14) 2733-2738 (2012)